Merge branch 'ph/groupsMergeRequestListPerformanceFix' into 'master'

Improve loading time of group Vue merge request list

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/177283



Merged-by: Kushal Pandya <kushal@gitlab.com>
Approved-by: Kushal Pandya <kushal@gitlab.com>
Co-authored-by: Phil Hughes <me@iamphill.com>